$(document).ready(function(){

	var total	=	0;
	var current	=	0;
	var width	=	111;
	var totalwidth	=	444;
	
	$(".slider_slide .thumb").each(function(){
	
		total	-=	width;
	
	});
	
	total		+=	444;
	
	$(".btnnext").click(function(){
		
		if(current > total){

			current	-=	width;
		
			$(".slider_slide").animate({"left": current}, 200);
			
		}
	
	});
	
	$(".btnprev").click(function(){
		
		if(current < 0){

			current	+=	width;
		
			$(".slider_slide").animate({"left": current}, 200);
			
		}
	
	});

});